diff --git a/bootstrap b/bootstrap
index 7012301..5a29d5f 100755
--- a/bootstrap
+++ b/bootstrap
@@ -1,5 +1,2 @@
-#!/bin/bash
-
-mkdir -p m4
+#!/bin/sh
 autoreconf -vif
-
diff --git a/m4/.keep b/m4/.keep
new file mode 100644
index 0000000..e69de29